After making changes, you must package the files back into the original structure: Compress the folders back into a Rename the extension back to 📲 How to Restore Your Modified File
On checkm8-compatible devices, you can modify iBEC (the bootloader loaded into RAM) to disable signature checks for subsequent images. modify ipsw file
If you are working with older devices, these tools automate the "modify and build" process: After making changes, you must package the files